109 lines
3.7 KiB
Plaintext
109 lines
3.7 KiB
Plaintext
include::meta/VK_EXT_shader_subgroup_ballot.txt[]
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*Last Modified Date*::
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2016-11-28
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*IP Status*::
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No known IP claims.
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*Interactions and External Dependencies*::
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- This extension requires the
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https://www.khronos.org/registry/spir-v/extensions/KHR/SPV_KHR_shader_ballot.html[+SPV_KHR_shader_ballot+]
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SPIR-V extension.
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- This extension requires the
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https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_shader_ballot.txt[+GL_ARB_shader_ballot+]
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extension for GLSL source languages.
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*Contributors*::
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- Jeff Bolz, NVIDIA
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- Neil Henning, Codeplay
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- Daniel Koch, NVIDIA Corporation
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This extension adds support for the following SPIR-V extension in Vulkan:
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* +SPV_KHR_shader_ballot+
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This extension provides the ability for a group of invocations, which
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execute in parallel, to do limited forms of cross-invocation communication
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via a group broadcast of a invocation value, or broadcast of a bitarray
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representing a predicate value from each invocation in the group.
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This extension provides access to a number of additional built-in shader
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variables in Vulkan:
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* code:SubgroupEqMaskKHR, which contains the subgroup mask of the current
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subgroup invocation,
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* code:SubgroupGeMaskKHR, which contains the subgroup mask of the
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invocations greater than or equal to the current invocation,
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* code:SubgroupGtMaskKHR, which contains the subgroup mask of the
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invocations greater than the current invocation,
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* code:SubgroupLeMaskKHR, which contains the subgroup mask of the
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invocations less than or equal to the current invocation,
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* code:SubgroupLtMaskKHR, which contains the subgroup mask of the
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invocations less than the current invocation,
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* code:SubgroupLocalInvocationId, which contains the index of an
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invocation within a subgroup, and
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* code:SubgroupSize, which contains the maximum number of invocations in a
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subgroup.
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Additionally, this extension provides access to the new SPIR-V instructions:
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* code:OpSubgroupBallotKHR,
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* code:OpSubgroupFirstInvocationKHR, and
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* code:OpSubgroupReadInvocationKHR,
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When using GLSL source-based shader languages, the following variables and
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shader functions from GL_ARB_shader_ballot can map to these SPIR-V built-in
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decorations and instructions:
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* `in uint64_t gl_SubGroupEqMaskARB;` -> code:SubgroupEqMaskKHR,
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* `in uint64_t gl_SubGroupGeMaskARB;` -> code:SubgroupGeMaskKHR,
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* `in uint64_t gl_SubGroupGtMaskARB;` -> code:SubgroupGtMaskKHR,
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* `in uint64_t gl_SubGroupLeMaskARB;` -> code:SubgroupLeMaskKHR,
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* `in uint64_t gl_SubGroupLtMaskARB;` -> code:SubgroupLtMaskKHR,
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* `in uint gl_SubGroupInvocationARB;` -> code:SubgroupLocalInvocationId,
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* `uniform uint gl_SubGroupSizeARB;` -> code:SubgroupSize,
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* code:ballotARB() -> code:OpSubgroupBallotKHR,
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* code:readFirstInvocationARB() -> code:OpSubgroupFirstInvocationKHR, and
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* code:readInvocationARB() -> code:OpSubgroupReadInvocationKHR.
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=== New Object Types
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None.
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=== New Enum Constants
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None.
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=== New Enums
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None.
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=== New Structures
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None.
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=== New Functions
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None.
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=== New Built-In Variables
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* <<interfaces-builtin-variables-sgeq,code:SubgroupEqMaskKHR>>
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* <<interfaces-builtin-variables-sgge,code:SubgroupGeMaskKHR>>
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* <<interfaces-builtin-variables-sggt,code:SubgroupGtMaskKHR>>
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* <<interfaces-builtin-variables-sgle,code:SubgroupLeMaskKHR>>
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* <<interfaces-builtin-variables-sglt,code:SubgroupLtMaskKHR>>
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* <<interfaces-builtin-variables-sgli,code:SubgroupLocalInvocationId>>
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* <<interfaces-builtin-variables-sgs,code:SubgroupSize>>
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=== New SPIR-V Capabilities
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* <<spirvenv-capabilities-table-subgroupballot,SubgroupBallotKHR>>
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=== Issues
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None.
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=== Version History
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* Revision 1, 2016-11-28 (Daniel Koch)
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- Initial draft
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